Dodge D150 1990 Service Manual page 794

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STEERING 19 - 15
(1) T i g h t e n the wormshaft bearing adjustment p l u g
u n t i l i t is " s n u g " t i g h t against t h e bearing, t h e n
loosen the adjustment cap 1/4 of-a-turn.
(2) I n s t a l l a l o w c a l i b r a t i o n (e.g., inch-pounds)
torque b a r w i t h a socket w r e n c h o n t h e splined end
of t h e wormshaft.
T h e " p r e l o a d " t o r q u e a d j u s t m e n t m u s t b e ac-
c o m p l i s h e d w i t h t h e w o r m s h a f t r o t a t e d a w a y a
m a x i m u m o f 1/2 o f - a - t u r n from e i t h e r t h e f u l l -
r i g h t o r t h e f u l l - l e f t t u r n s t o p p o s i t i o n s .
(3) Rotate t h e wormshaft clockwise or counterclock-
wise t o the stop position and t h e n away 1/2 of-a-turn
f r o m the stop position.
(4) T i g h t e n the wormshaft b e a r i n g adjustment p l u g
(Fig. 18) u n t i l t h e torque r e q u i r e d t o rotate t h e
wormshaft i s 0.6 to 1.0 N T H (5 t o 8 in-lbs) torque.
ADJUSTMENT TORQUE BAR
CAP WITH SOCKET WRENCH
J89
19-23
Fig. 18 Wormshaft Bearing "Preload" Torque
Adjustment
(5) T i g h t e n t h e adjustment cap l o c k n u t w i t h 68
N T H (50 ft-lbs) torque a n d measure t h e "preload"
torque. I f necessary, adjust t h e "preload" torque
a g a i n . Record t h e "preload" torque for later refer-
ence.
CAUTION: Do not attempt to adjust the pitman shaft
overcenter drag torque before the wormshaft bear-
ing "preload" torque has been adjusted.
(6) Adjust the p i t m a n shaft overcenter drag torque:
• rotate t h e wormshaft f r o m stop-to-stop, count t h e
t o t a l number o f rotations, and rotate t h e wormshaft
i n t h e reverse direction 1/2 o f the t o t a l n u m b e r of ro-
t a t i o n s t o center the b a l l n u t / p i t m a n shaft;
• place a l o w calibration (e.g., inch-pounds) torque
b a r w i t h a socket wrench o n t h e wormshaft splines
(Fig. 19) and, w h i l e r o t a t i n g the wormshaft back and
f o r t h overcenter, t i g h t e n t h e p i t m a n shaft adjust-
ment screw u n t i l t h e torque required to rotate t h e
shaft is 1.6 N * m (14 in-lbs);
TORQUE BAR
AND SOCKET
WRENCH
J8919-24
Fig. 19 Overcenter Drag Torque Adjustment
• t h e overcenter d r a g torque represents t h e t o t a l of
the wormshaft bearing "preload" torque and t h e b a l l
n u t rack/sector shaft gear teeth mesh f r i c t i o n load
(re-adjust the sector shaft adjustment screw, i f neces-
sary to obtain the correct drag torque);
• hold t h e p i t m a n shaft adjustment screw a n d
t i g h t e n t h e locknut w i t h 47 N T H (35 ft-lbs) torque;
and
• after t i g h t e n i n g t h e locknut, measure t h e over-
center drag torque again and re-adjust t h e torque, i f
necessary.
I f t h e a d j u s t m e n t s c r e w i s a l l o w e d t o r o t a t e
w h i l e t i g h t e n i n g t h e l o c k n u t , t h e c o m p l e t e o v e r -
c e n t e r d r a g t o r q u e a d j u s t m e n t p r o c e d u r e m u s t
b e r e p e a t e d .
INSTALLATION
(1) Position the steering gear a t the frame r a i l and
i n s t a l l t h e attaching bolts. T i g h t e n t h e a t t a c h i n g
bolts w i t h 136 N-m (100 ft-lbs) torque.
(2) Connect t h e steering intermediate shaft to t h e
steering gear.
(3) W i t h the p i t m a n a r m and the shaft i n s t a l l a t i o n
reference marks aligned, position t h e p i t m a n (steer-
ing) a r m on the p i t m a n shaft.
(4) I n s t a l l t h e washers a n d t h e r e t a i n i n g n u t on
the p i t m a n shaft and t i g h t e n t h e n u t w i t h 237 N T H
(175 ft-lbs) torque. I n s t a l l a replacement cotter p i n .